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<a href="simple__ostream__logger_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#include &quot;<a class="code" href="simple__ostream__logger_8hpp.html">flow/log/simple_ostream_logger.hpp</a>&quot;</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="preprocessor">#include &quot;<a class="code" href="config_8hpp.html">flow/log/config.hpp</a>&quot;</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1log.html">flow::log</a></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span>{</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="comment">// Implementations.</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span> </div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Simple__ostream__logger.html#a5ee701f0f163047f9620ab91d653da18">   27</a></span><a class="code hl_function" href="classflow_1_1log_1_1Simple__ostream__logger.html#a5ee701f0f163047f9620ab91d653da18">Simple_ostream_logger::Simple_ostream_logger</a>(<a class="code hl_class" href="classflow_1_1log_1_1Config.html">Config</a>* config,</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span>                                             std::ostream&amp; os, std::ostream&amp; os_for_err) :</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span>  m_config(config)</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span>{</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span>  <span class="comment">/* If stream is same for both types of messages, might as well use only one Ostream_log_msg_writer for both.</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span><span class="comment">   * It&#39;s just prettier (e.g., stream state saved/restores 1x instead of 2x) and a little better for performance.</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment">   * However there could be 2+ Simple_ostream_loggers sharing the same ostream; nothing we can (reasonably) do to</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment">   * detect that -- nor NEED we worry about it really; just a nicety. */</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span>  <a class="code hl_variable" href="classflow_1_1log_1_1Simple__ostream__logger.html#a1ef85d2192fb0cd3977944a20bfa61f9">m_os_writers</a>[0] = <a class="code hl_typedef" href="classflow_1_1log_1_1Simple__ostream__logger.html#aab34dd83954eeea35278207912589d0f">Ostream_log_msg_writer_ptr</a>(<span class="keyword">new</span> <a class="code hl_class" href="classflow_1_1log_1_1Ostream__log__msg__writer.html">Ostream_log_msg_writer</a>(*<a class="code hl_variable" href="classflow_1_1log_1_1Simple__ostream__logger.html#a57abde2223144cdec0f1f4edc35fdc88">m_config</a>, os));</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span>  <a class="code hl_variable" href="classflow_1_1log_1_1Simple__ostream__logger.html#a1ef85d2192fb0cd3977944a20bfa61f9">m_os_writers</a>[1]</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span>    = (&amp;os == &amp;os_for_err)</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span>        ? <a class="code hl_variable" href="classflow_1_1log_1_1Simple__ostream__logger.html#a1ef85d2192fb0cd3977944a20bfa61f9">m_os_writers</a>[0]</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span>        : <a class="code hl_typedef" href="classflow_1_1log_1_1Simple__ostream__logger.html#aab34dd83954eeea35278207912589d0f">Ostream_log_msg_writer_ptr</a>(<span class="keyword">new</span> <a class="code hl_class" href="classflow_1_1log_1_1Ostream__log__msg__writer.html">Ostream_log_msg_writer</a>(*<a class="code hl_variable" href="classflow_1_1log_1_1Simple__ostream__logger.html#a57abde2223144cdec0f1f4edc35fdc88">m_config</a>, os_for_err));</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span>  <span class="comment">// See m_os_writers doc header for details about how they are freed at `*this` destruction.</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span>}</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span> </div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Simple__ostream__logger.html#aaf1987dc4e163db1c13e6f4407135fa9">   43</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classflow_1_1log_1_1Simple__ostream__logger.html#aaf1987dc4e163db1c13e6f4407135fa9">Simple_ostream_logger::should_log</a>(<a class="code hl_enumeration" href="namespaceflow_1_1log.html#a5c602384e6fe9d7642740ac2fae4ad04">Sev</a> sev, <span class="keyword">const</span> <a class="code hl_class" href="classflow_1_1log_1_1Component.html">Component</a>&amp; component) <span class="keyword">const</span> <span class="comment">// Virtual.</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span>{</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span>  <span class="keywordflow">return</span> m_config-&gt;output_whether_should_log(sev, component);</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>}</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span> </div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Simple__ostream__logger.html#a1548d51e8314a9cff0669f20cae9ae76">   48</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classflow_1_1log_1_1Simple__ostream__logger.html#a1548d51e8314a9cff0669f20cae9ae76">Simple_ostream_logger::logs_asynchronously</a>() const <span class="comment">// Virtual.</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>{</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>}</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span> </div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Simple__ostream__logger.html#a44192b92a16bc07f8d99beb6ad25c826">   53</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1log_1_1Simple__ostream__logger.html#a44192b92a16bc07f8d99beb6ad25c826">Simple_ostream_logger::do_log</a>(<a class="code hl_struct" href="structflow_1_1log_1_1Msg__metadata.html">Msg_metadata</a>* metadata, <a class="code hl_typedef" href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">util::String_view</a> msg) <span class="comment">// Virtual.</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span>{</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span>  assert(metadata);</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span> </div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span>  <span class="comment">/* Prevent simultaneous logging.</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment">   * (Consider also mutex per each of m_os_writers[] instead of sharing one.  That would reduce lock contention.</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment">   * However, often m_os_writers[] would really write to the same device such as terminal console or log file.</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment">   * Thus, possibly this would cause interleaving of output in an undesirable way, which is basically what the mutex</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment">   * is designed to avoid in the first place.  Maybe some buffering aspect would prevent interleaving in that case,</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment">   * but it seems imprudent to count on it, or at least to have to worry about it.)</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment">   *</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment">   * Oh, of course we could also invoke only one mutex if m_os_writers[] streams are the same object -- trivial.</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment">   * However, even if they are different, the user can then make them write to the same thing using 2&gt;&amp;1 on command</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment">   * line, for example.  So it still seems best to avoid any interleaving even when it&#39;s further away from our control,</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment">   * as in that latter situation.  So just don&#39;t mess with it and always use one mutex to avoid as much interleaving</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment">   * as we can. */</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span>  <a class="code hl_typedef" href="namespaceflow_1_1util.html#a5d2247b715da63e4b960909561b90ae7">util::Lock_guard</a>&lt;<span class="keyword">decltype</span>(<a class="code hl_variable" href="classflow_1_1log_1_1Simple__ostream__logger.html#afb59fd5bf48efeb52d11af8a2d4d2379">m_log_mutex</a>)&gt; lock(<a class="code hl_variable" href="classflow_1_1log_1_1Simple__ostream__logger.html#afb59fd5bf48efeb52d11af8a2d4d2379">m_log_mutex</a>);</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span> </div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span>  <span class="comment">/* This next part will block calling thread for however long the writing takes.</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment">   * This is likely not an issue with cout/cerr but can be a significant issue with ofstream.  Hence why</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment">   * Async_file_logger exists. */</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span>  <a class="code hl_variable" href="classflow_1_1log_1_1Simple__ostream__logger.html#a1ef85d2192fb0cd3977944a20bfa61f9">m_os_writers</a>[(metadata-&gt;<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a38ed0fc480839dd1c177fa5a8d59368a">m_msg_sev</a> &gt; <a class="code hl_enumvalue" href="namespaceflow_1_1log.html#a5c602384e6fe9d7642740ac2fae4ad04a4aee6034ce9dbc2b5c36f27c80abe021">Sev::S_WARNING</a>) ? 0 : 1]-&gt;log(*metadata, msg);</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span>}</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span> </div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span>} <span class="comment">// namespace flow::log</span></div>
<div class="ttc" id="aclassflow_1_1log_1_1Component_html"><div class="ttname"><a href="classflow_1_1log_1_1Component.html">flow::log::Component</a></div><div class="ttdoc">A light-weight class, each object storing a component payload encoding an enum value from enum type o...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l00839">log.hpp:840</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Config_html"><div class="ttname"><a href="classflow_1_1log_1_1Config.html">flow::log::Config</a></div><div class="ttdoc">Class used to configure the filtering and logging behavior of Loggers; its use in your custom Loggers...</div><div class="ttdef"><b>Definition:</b> <a href="config_8hpp_source.html#l00316">config.hpp:317</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html">flow::log::Ostream_log_msg_writer</a></div><div class="ttdoc">Utility class, each object of which wraps a given ostream and outputs discrete messages to it adorned...</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8hpp_source.html#l00102">ostream_log_msg_writer.hpp:104</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Simple__ostream__logger_html_a1548d51e8314a9cff0669f20cae9ae76"><div class="ttname"><a href="classflow_1_1log_1_1Simple__ostream__logger.html#a1548d51e8314a9cff0669f20cae9ae76">flow::log::Simple_ostream_logger::logs_asynchronously</a></div><div class="ttdeci">bool logs_asynchronously() const override</div><div class="ttdoc">Implements interface method by returning false, indicating that this Logger will not need the content...</div><div class="ttdef"><b>Definition:</b> <a href="simple__ostream__logger_8cpp_source.html#l00048">simple_ostream_logger.cpp:48</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Simple__ostream__logger_html_a1ef85d2192fb0cd3977944a20bfa61f9"><div class="ttname"><a href="classflow_1_1log_1_1Simple__ostream__logger.html#a1ef85d2192fb0cd3977944a20bfa61f9">flow::log::Simple_ostream_logger::m_os_writers</a></div><div class="ttdeci">boost::array&lt; Ostream_log_msg_writer_ptr, 2 &gt; m_os_writers</div><div class="ttdoc">Stream writers via which to log messages, each element corresponding to a certain set of possible sev...</div><div class="ttdef"><b>Definition:</b> <a href="simple__ostream__logger_8hpp_source.html#l00172">simple_ostream_logger.hpp:172</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Simple__ostream__logger_html_a44192b92a16bc07f8d99beb6ad25c826"><div class="ttname"><a href="classflow_1_1log_1_1Simple__ostream__logger.html#a44192b92a16bc07f8d99beb6ad25c826">flow::log::Simple_ostream_logger::do_log</a></div><div class="ttdeci">void do_log(Msg_metadata *metadata, util::String_view msg) override</div><div class="ttdoc">Implements interface method by synchronously logging the message and some subset of the metadata in a...</div><div class="ttdef"><b>Definition:</b> <a href="simple__ostream__logger_8cpp_source.html#l00053">simple_ostream_logger.cpp:53</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Simple__ostream__logger_html_a57abde2223144cdec0f1f4edc35fdc88"><div class="ttname"><a href="classflow_1_1log_1_1Simple__ostream__logger.html#a57abde2223144cdec0f1f4edc35fdc88">flow::log::Simple_ostream_logger::m_config</a></div><div class="ttdeci">Config *const m_config</div><div class="ttdoc">Reference to the config object passed to constructor. Note that object is mutable; see notes on threa...</div><div class="ttdef"><b>Definition:</b> <a href="simple__ostream__logger_8hpp_source.html#l00154">simple_ostream_logger.hpp:154</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Simple__ostream__logger_html_a5ee701f0f163047f9620ab91d653da18"><div class="ttname"><a href="classflow_1_1log_1_1Simple__ostream__logger.html#a5ee701f0f163047f9620ab91d653da18">flow::log::Simple_ostream_logger::Simple_ostream_logger</a></div><div class="ttdeci">Simple_ostream_logger(Config *config, std::ostream &amp;os=std::cout, std::ostream &amp;os_for_err=std::cerr)</div><div class="ttdoc">Constructs logger to subsequently log to the given standard ostream (or 2 thereof).</div><div class="ttdef"><b>Definition:</b> <a href="simple__ostream__logger_8cpp_source.html#l00027">simple_ostream_logger.cpp:27</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Simple__ostream__logger_html_aab34dd83954eeea35278207912589d0f"><div class="ttname"><a href="classflow_1_1log_1_1Simple__ostream__logger.html#aab34dd83954eeea35278207912589d0f">flow::log::Simple_ostream_logger::Ostream_log_msg_writer_ptr</a></div><div class="ttdeci">boost::shared_ptr&lt; Ostream_log_msg_writer &gt; Ostream_log_msg_writer_ptr</div><div class="ttdoc">Short-hand for ref-counted pointer to a given Ostream_log_msg_writer. See m_os_writers for ref-count ...</div><div class="ttdef"><b>Definition:</b> <a href="simple__ostream__logger_8hpp_source.html#l00161">simple_ostream_logger.hpp:161</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Simple__ostream__logger_html_aaf1987dc4e163db1c13e6f4407135fa9"><div class="ttname"><a href="classflow_1_1log_1_1Simple__ostream__logger.html#aaf1987dc4e163db1c13e6f4407135fa9">flow::log::Simple_ostream_logger::should_log</a></div><div class="ttdeci">bool should_log(Sev sev, const Component &amp;component) const override</div><div class="ttdoc">Implements interface method by returning true if the severity and component (which is allowed to be n...</div><div class="ttdef"><b>Definition:</b> <a href="simple__ostream__logger_8cpp_source.html#l00043">simple_ostream_logger.cpp:43</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Simple__ostream__logger_html_afb59fd5bf48efeb52d11af8a2d4d2379"><div class="ttname"><a href="classflow_1_1log_1_1Simple__ostream__logger.html#afb59fd5bf48efeb52d11af8a2d4d2379">flow::log::Simple_ostream_logger::m_log_mutex</a></div><div class="ttdeci">util::Mutex_non_recursive m_log_mutex</div><div class="ttdoc">Mutex protecting against log messages being logged concurrently and thus being garbled.</div><div class="ttdef"><b>Definition:</b> <a href="simple__ostream__logger_8hpp_source.html#l00175">simple_ostream_logger.hpp:175</a></div></div>
<div class="ttc" id="aconfig_8hpp_html"><div class="ttname"><a href="config_8hpp.html">config.hpp</a></div></div>
<div class="ttc" id="anamespaceflow_1_1log_html"><div class="ttname"><a href="namespaceflow_1_1log.html">flow::log</a></div><div class="ttdoc">Flow module providing logging functionality.</div><div class="ttdef"><b>Definition:</b> <a href="async__file__logger_8cpp_source.html#l00027">async_file_logger.cpp:28</a></div></div>
<div class="ttc" id="anamespaceflow_1_1log_html_a5c602384e6fe9d7642740ac2fae4ad04"><div class="ttname"><a href="namespaceflow_1_1log.html#a5c602384e6fe9d7642740ac2fae4ad04">flow::log::Sev</a></div><div class="ttdeci">Sev</div><div class="ttdoc">Enumeration containing one of several message severity levels, ordered from highest to lowest.</div><div class="ttdef"><b>Definition:</b> <a href="log__fwd_8hpp_source.html#l00223">log_fwd.hpp:224</a></div></div>
<div class="ttc" id="anamespaceflow_1_1log_html_a5c602384e6fe9d7642740ac2fae4ad04a4aee6034ce9dbc2b5c36f27c80abe021"><div class="ttname"><a href="namespaceflow_1_1log.html#a5c602384e6fe9d7642740ac2fae4ad04a4aee6034ce9dbc2b5c36f27c80abe021">flow::log::Sev::S_WARNING</a></div><div class="ttdeci">@ S_WARNING</div><div class="ttdoc">Message indicates a &quot;bad&quot; condition that is not frequent enough to be of severity Sev::S_TRACE.</div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a5d2247b715da63e4b960909561b90ae7"><div class="ttname"><a href="namespaceflow_1_1util.html#a5d2247b715da63e4b960909561b90ae7">flow::util::Lock_guard</a></div><div class="ttdeci">boost::unique_lock&lt; Mutex &gt; Lock_guard</div><div class="ttdoc">Short-hand for advanced-capability RAII lock guard for any mutex, ensuring exclusive ownership of tha...</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00265">util_fwd.hpp:265</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_ae4dc52186797094b3040379ff19124c9"><div class="ttname"><a href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">flow::util::String_view</a></div><div class="ttdeci">Basic_string_view&lt; char &gt; String_view</div><div class="ttdoc">Commonly used char-based Basic_string_view. See its doc header.</div><div class="ttdef"><b>Definition:</b> <a href="string__view_8hpp_source.html#l00191">string_view.hpp:191</a></div></div>
<div class="ttc" id="asimple__ostream__logger_8hpp_html"><div class="ttname"><a href="simple__ostream__logger_8hpp.html">simple_ostream_logger.hpp</a></div></div>
<div class="ttc" id="astructflow_1_1log_1_1Msg__metadata_html"><div class="ttname"><a href="structflow_1_1log_1_1Msg__metadata.html">flow::log::Msg_metadata</a></div><div class="ttdoc">Simple data store containing all of the information generated at every logging call site by flow::log...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01040">log.hpp:1041</a></div></div>
<div class="ttc" id="astructflow_1_1log_1_1Msg__metadata_html_a38ed0fc480839dd1c177fa5a8d59368a"><div class="ttname"><a href="structflow_1_1log_1_1Msg__metadata.html#a38ed0fc480839dd1c177fa5a8d59368a">flow::log::Msg_metadata::m_msg_sev</a></div><div class="ttdeci">Sev m_msg_sev</div><div class="ttdoc">Severity of message, typically determined by choice of macro (e.g., FLOW_LOG_WARNING() vs.</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01051">log.hpp:1051</a></div></div>
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